37.5% is the change from 168 to 231
Calculation steps:
[( 231 - 168 ) ÷ 168] x 100 = 37.5%
Formula
Percentage change = [(231 - 168) / 168] x 100
Subtract the new number by the original number
231 - 168 = 63
63 ÷ 168 = 0.375
0.375 x 100 = 37.5%
Example